After building an amp for our house record player, you could only play-back record with an annoyingly loud hum; a grounding problem, in that it wasn't grounded from the player to the amp.
A quick search online found someone else who'd had the exact same problem;
It was also a good time to clean out some of the 30 year old dust that had accumulated.
|The Black cable is the ground wire.|
|Make sure it has a good connection|
|Connecting it to the amp|
|Running the cable out the back of the Record Deck|
|Record Player PCB|
|Might as well give it a dust while it's open|
|We can now listen to hum-free music!|